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Severe network instability and a WAN IP issue.

Hello!

I'll start off simple, basically 2 weeks ago my home network started suffering from high latency and speeds being slowed down to a crawl. Typical network usage involves gaming and media streaming.

I started off with the usual troubleshooting steps: restarting router + devices, leaving them off for a while, leaving a single device connected to measure stability, but neither showed signs of improved latency.

Typical latency measurements before issues:
Average latency: 20-30ms idle, 40-60ms while gaming.
Current average latency: 20-50ms idle, 260-300ms while gaming.

After some research, all the signs were pointing towards bufferbloat. So I switched the Hub to Modem Mode, connected my Desktop to the first port, closed all applications to have as minimal outgoing and incoming connections as possible, and ran the test. Sure enough, got a D rating for bufferbloat with ping spiking as high as 500ms.

I had a TP-Link Archer C60 that was collecting dust and decided to try its QoS feature to see if that would help. Initially the spiking was less frequent, but it didn't last long and the latency sky rockets and stays there until I sit there idling.

On the 17th of October, shortly after 13:00, I started tracking my network via ThinkBroadband.
BQM 17/10/2020
Latency is just all over the place with packet loss appearing towards the evening.

The following day I noticed a weird pattern occurring, high latency spikes during almost every single hour of the day.
BQM 18/10/2020 
The spiking pattern is still happening to this day.

For the bufferbloat issue, I'm still deciding on what to do but it looks like I might buy a router on which I can flash OpenWrt and use SQM.

Anyway, here's something that needs to be explained to me.
I live in Glasgow (area ref 28) and have always had a WAN IP starting with 86. Now a few days ago I decided to switch the Hub back to Router Mode and monitor the network logs, and that's when I noticed that my Hub now has a WAN IP that starts with 81. Surely that can't be right? Speed tests kept setting my closest server as London, specifically Brentford as the most common server.

Switched the Hub to Modem Mode, used my TP-Link router and the interface showed the typical WAN IP starting with 86 with proper servers being targeted now.

I'm wondering if someone is able to make sense out of this mess. 🤔

If additional telemetry, logs or other network information is needed, I can provide that.

BQM Live Graph 

Thank you!

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Re: Severe network instability and a WAN IP issue.

The regularity of the pattern in your BQM suggest a technical equipment problem rather than conventional noise or power issues.  VM forum staff can advise when they pick up your post.

Regarding the IP issues, there's been some recent changes (my own IP address changed for no reason obvious to me).  The "London" location may be down to inaccurate assumptions by whichever service this shows up on, or it could reflect a change of exit point from VM's network to the public internet.  Either way I wouldn't have thought that this would adversely affect you.

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Re: Severe network instability and a WAN IP issue.

Understood, I'll wait for a staff member to reply.

I always thought the way VM distributes IP addresses is based on what city you are in, but I'll stop worrying about that now.
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Re: Severe network instability and a WAN IP issue.

Probably is done that way, but given that they aren't minting any new IPv4 addresses, it's possible that VM are having to reallocate them based on customer growth in some areas?  Until the other services that ascribe a location to an IP address catch up it'll remain odd.  That might also explain my change of IP.

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Re: Severe network instability and a WAN IP issue.

Data from Router Status.

Downstream

 DS-1DS-2DS-3DS-4DS-5DS-6DS-7DS-8
Frequency (Hz)139000000147000000155000000163000000171000000179000000187000000195000000
Lock Status(QAM Lock/FEC Sync/MPEG Lock)LockedLockedLockedLockedLockedLockedLockedLocked
Channel ID12345678
Modulation256QAM256QAM256QAM256QAM256QAM256QAM256QAM256QAM
Symbol Rate (Msym/sec)6.9520006.9520006.9520006.9520006.9520006.9520006.9520006.952000
Interleave DepthI=12
J=17
I=12
J=17
I=12
J=17
I=12
J=17
I=12
J=17
I=12
J=17
I=12
J=17
I=12
J=17
Power Level (dBmV)-4.61-4.32-4.12-3.85-3.91-3.76-3.50-3.10
RxMER (dB)35.6035.4235.9735.4236.1736.3936.3936.84
Pre RS Errors975612992898574068460783106613109840358678899944231990025
Post RS Errors251381176985521760626816559273548996373243863

 

Upstream

 US-1US-2US-3US-4
Channel Type2.02.02.02.0
Channel ID5324
Frequency (Hz)32600000462000005370000039400000
Ranging StatusSuccessSuccessSuccessSuccess
Modulation64QAM64QAM64QAM64QAM
Symbol Rate (Sym/sec)5120000512000051200005120000
Mini-Slot Size2222
Power Level (dBmV)46.0046.0046.0046.25
T1 Timeouts0000
T2 Timeouts0000
T3 Timeouts2000
T4 Timeouts0000

 

Primary Downstream Service Flow

SFID160886
Max Traffic Rate117000047 bps
Max Traffic Burst42600 bytes
Min Traffic Rate0 bps

 

Primary Upstream Service Flow

SFID160885
Max Traffic Rate10500047 bps
Max Traffic Burst16320 bytes
Min Traffic Rate0 bps
Max Concatenated Burst16320 bytes
Scheduling TypeBest Effort

 

Network Log

First TimeLast TimePriorityError NumberDescription
20/10/2020 22:50:24 GMT20/10/2020 22:50:24 GMTError (4)68010100DHCP RENEW sent - No response for IPv4
19/10/2020 11:01:55 GMT19/10/2020 11:01:55 GMTWarning (5)66050310Auth Success - Web login successful.
17/10/2020 21:48:40 GMT17/10/2020 21:48:40 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 21:48:22 GMT17/10/2020 21:48:22 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 21:41:15 GMT17/10/2020 21:41:15 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 21:20:21 GMT17/10/2020 21:20:21 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 21:15:56 GMT17/10/2020 21:15:56 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 21:11:40 GMT17/10/2020 21:11:40 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:56:49 GMT17/10/2020 20:56:49 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:54:22 GMT17/10/2020 20:54:22 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:53:15 GMT17/10/2020 20:53:15 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:48:46 GMT17/10/2020 20:48:46 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:47:38 GMT17/10/2020 20:47:38 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:46:16 GMT17/10/2020 20:46:16 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:44:29 GMT17/10/2020 20:44:29 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:43:29 GMT17/10/2020 20:43:29 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:26:47 GMT17/10/2020 20:26:47 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:05:12 GMT17/10/2020 20:05:12 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:04:18 GMT17/10/2020 20:04:18 GMTWarning (5)84020200Lost MDD Timeout
17/10/2020 20:04:03 GMT17/10/2020 20:04:03 GMTWarning (5)84020200Lost MDD Timeout

 

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Message 6 of 7
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Re: Severe network instability and a WAN IP issue.

Hi IngaG, thanks for posting and welcome to our community.

Sorry to hear you're having issues with your internet.  I would like to take a closer look. To enable me to do so, I am going to send you a private message. Please look out for the purple envelope in the top right of your screen.
Regards


Lee_R

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Message 7 of 7
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Re: Severe network instability and a WAN IP issue.

Update from a week later.

Currently BQM readings seem to suggest quite stable latency measurements, in terms of average latency. Maximum latency is still all over the place.

BQM 24/10/2020 - Abnormal latency pattern disappears.
BQM 25/10/2020 - First day with no major spikes.

Now, looking closely at the maximum latency spikes, the abnormal spiking pattern is potentially still ongoing but no high latency measurements appear unless downloading.
Also on the 27th, at around 1:20am, the network went down for maintenance for a few minutes, although this didn't seem to fix the maximum latency spikes.

Also now that Virgin staff have responded, hopefully I can get an engineer to investigate whether there is an issue with my router or the line itself.

Updated Router Status data.

Downstream

Lock StatusChannel IDFrequencyModulationRx PowerRxMERPre RS ErrorsPost RS Errors
Locked17267000000 Hz256 QAM-0.1 dBmV 38.3 dB6811308
Locked18275000000 Hz256 QAM0.3 dBmV 38.3 dB4103288
Locked19283000000 Hz256 QAM0.4 dBmV 37.9 dB659302
Locked20291000000 Hz256 QAM0.8 dBmV 37.9 dB1953301
Locked21299000000 Hz256 QAM0.9 dBmV 39.0 dB299298
Locked22307000000 Hz256 QAM1.4 dBmV 39.4 dB312310
Locked23315000000 Hz256 QAM1.6 dBmV 39.4 dB282281
Locked24323000000 Hz256 QAM1.9 dBmV 39.0 dB322322

 

Upstream

Lock StatusChannel IDFrequency ModulationTx PowerModeChannel BandwidthSymbol Rate
Locked532600000 HzATDMA46.0 dBmV64QAM6400000 Hz5120 Ksym/sec
Locked346200000 HzATDMA45.8 dBmV64QAM6400000 Hz5120 Ksym/sec
Locked253700000 HzATDMA45.8 dBmV64QAM6400000 Hz5120 Ksym/sec
Locked439400000 HzATDMA46.0 dBmV64QAM6400000 Hz5120 Ksym/sec

 

Network Log

29/10/202017:56:26 GMT90000200CSFR Detect - Expired Content Submitted ; LAN Interface
29/10/202017:55:51 GMT66050310Auth Success - Web login successful.
27/10/202010:11:12 GMT66050310Auth Success - Web login successful.
27/10/202001:53:32 GMT68010300DHCP RENEW WARNING - Field invalid in response v4 option
27/10/202001:24:18 GMT68010302DHCP WAN IP - 82.XX.XX.XX
27/10/202001:23:35 GMT82000200No Ranging Response received - T3 time-out
27/10/202001:23:33 GMT68000407TOD established
27/10/202001:23:22 GMT84000510Downstream Locked Successfully
27/10/202001:23:03 GMT82000400Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
27/10/202001:23:01 GMT82000400Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
27/10/202001:23:01 GMT82000400Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
27/10/202001:23:01 GMT82000400Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
27/10/202001:18:07 GMT84020200Lost MDD Timeout
27/10/202001:18:07 GMT84020200Lost MDD Timeout
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